iPadOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2019-04-08T17:04:38Z. The update package is 387.09 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 19e36e5b07907af4209f60faf1358317d2bba2b4.zip.